Resistance-cup.



' F. GOTTSGHALK.

RESISTANCE CUP.

APPLICATION FILED JUNE 3, 1908.

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ATTORNEY WITNESSES FELIX GOTTSCHALK, OF NEW YORK, Y.

RE SISTANCECUP.

Specification of Letters Patent.

Patentedquiy 2o, 1909'.

Appiicaaon sied June s, 190s. seria! No. 436,403;

To all lwhom it may concern:

Be it known that l, Fenix (iro'risciLxLii, a citizen ot the UnitedStates ot America, and resident of New York, in the county ot' New Yorkand State ot' New York, have invented certain new and uset'ullmprovements in Resistance-Cups, of which the following is a full,clear, and exact description.

This invention relates to resistance-cups for telephone-tansmitters, andmore especially to those ot' microphones in which granular orfinely-divided material, such as powi'lered carbon, is used as theresist-ancerarying medium, and it has for one of its objects theprovision of an instrument of this kind` in which the carbon granulesbetweep the electrodes will be prevented from packing into practically asolid body.

My invention has, furtliern'iore, for its obj ct the provision in thecarbon-receiving cup, of a series ot' partitions made of insulating`material whereby the granules are separated iiito small quantitieswhich, however, ai'e in contact with the top and bottom electrodes. l

A further object ot' this invention resides in the combination, with thecarbon-cup, of a flexible multi-partitioned device which may be insertedor removed from the cnp.

Experience has demonstrated the fact that the granulatedl carbon betweenthe electrodes is apt to become packed under certain atmosphericconditions, in which the temperature constitutes one of the factors tobe taken in consideration, so that when any contraction ot' the metalcup takes place, the resulting compression otthe carbon granules will beaptl to pack the latter, thus rendering the soinul-transmissiondefective and causing the' carbon to heat, which latter fact, in turn,causes frying. By virtue of my present ,invention-tam enabled to avoidthe objections su'lliciently for all practical purposes, inasmuch as ldivide the granular mass into a series of smaller quantities separatedfrom each other by flexible partitions which will compensate for anycompression resulting from atmospheric changes and also for theexpansion of the carbon caused by heat diie to short circuit', and whichwill adapt themselves to the rapid interchange in position ot' thegranules during the diiiierent retract-ions ot the diaphragm.-Furthern'iore, inasmuch as the location of the partitions relative tothe electrodes remains permanent, it is evident that each separate massof granules between two adjacent partitions will natufront view thereof,the cap and mouth piece' being removed; Fig. 3 shows a section of myimproved electrode, on an enlarged scale; Fig. 4 is a perspective Viewof the carbon' sepa `ator, and Fig. 5 is a front View of a modificationof the separator. v

In the drawings, T denotes in a general waythe transmitter of atelephone, comprising a shell 10, and a casing or cap 11 on which theseveral elements of the device are supported. `Secured to the cap 11 isa bridge 12, carrying a post 13 which holds the bottom electrode let,fitted into a casing 15 of the resistance-cup but. separated therefromby an annular ring 16 of insulating material. The forward end of thecasing 15 is screwthreaded to receive aI cap plate 17 which serves tofirmly clamp in place a disk ot' mica v18 whereby the cup casing is thusclosed, and' which is disposed between the top electrode 1t) and awasher 20, these parts being held together by a stud 21 whereby the cupis also attached to the diaphragm 22, which may be held irl-place in anysuitable manner.

Disposed within the carbon-cup is a multipartition member 25 which inits preferred t'orm comprises an annular wall 26 (see Fig. 4) serving asa means for spacing and holding a number of partitions 27 whereby thecup chamber is divided into a series of 4separate compartments withinwhich granulated carbon is placed so as to entirely till the enpchamber.The depth ot the member 25 is such as to till the space between theelectrodes 14 and 19, so that the several carbon masses in thecompartments will be practically independent of each other, and eachwill constitute a separate and distinct medium for' receiving'andtransmitting the electric current passing from one electrode to theother.

ln order to produce the desired results previously mentioned, the memberis made of a yielding insulating material which is also Capable ofwithstanding heat such as may be generated by the resistance on the partof the carbon to the electric current.

In Fig. 5 I have illustrated a modification of the partition-member 25,the several divisions of which are separated from each other by circularpartitions 28, Vand crosspartitions 29, it being evident that thisformation of the partitlons will be as effective as that indicated inFig. 4.

I claim l; In a resistance cup for telephones or similar instruments,the combination with a casing, a pair of electrodesdisposed in saidcasing and insulated from each other, and granular conducting materialbetween the electrodes, of a member disposed within said casing and madeof insulating material and comprising a series of flexible partitions todivide said conducting material into separated quantities. A

` 2. In a resistance cup for telephones or similar instruments, thecombination with a casing, a pair of electrodes disposed therein andinsulated from each other, and granular conduti'ng material between theelectrodes,

' 'of a separat-ing member disposed within said casing and com rising aseries of flexible partitions exten ing between and contacting with theelectrodes and for dividing the conducting material into separatequantities.

In a resistance cup for telephones or similar instruments, thecombination with a casing, a pair of electrodes disposed therein andinsulated from each other, and granular conducting material between theelectrodes, of a separating member disposed between said electrodes andcomprising a series of partitions made of yielding material and fordividing said conducting material in`to separated quantities.

4. In a resistance cupl for telephones or similar instruments, thecombination with a casing, a pair of electrodes disposed therein andinsulated from each other, and from the casing, and granular conductingmaterial between and contacting with the electrodes, of a separatingmember interposed between the electrodes and made of heat resisting andyielding material and for'clividing said conducting material intoseparated quantities.

5. The combination with a cup, a pair of electrodes disposed in saidcup, granular material disposed between the electrodes and comprising haseries of flexible partitions extending between the electrodes and fordividing said conducting material into separate quantities, and a capfor closing said cup and for bringing the opposite edges of said memberinto Contact with the electrodes. l Signed by me at New York, N.'Y., inpresence of two subscribing Witnesses.

FELIX GOTTSCHALK. `IVitnesses R. B. MARTEN, y H. A. CROSBY.

